CN201666422U

CN201666422U - High-performance sealing washer

Info

Publication number: CN201666422U
Application number: CN200820119216XU
Authority: CN
Inventors: 圣约翰·富丽
Original assignee: Interface Solutions Inc
Current assignee: Interface Solutions Inc
Priority date: 2008-06-19
Filing date: 2008-06-19
Publication date: 2010-12-08
Anticipated expiration: 2018-06-19

Abstract

The utility model provides a sealing washer with two opposite surfaces and one edge; and a wider coating layer is arranged on the edge between the surfaces and the edge. The coating layer is wide enough so as to cover each corner of the edge and protrude on one surface of the washer by vertically getting across the corners on at least one edge of the washer. The external protruding quantity of the coating layer leads the washer to generate effective sealing capability, and the sealing capability is stronger than that of the coating layer that extends only from one corner to the other corner and has no outwards extruding part of the similar product.

Description

The high-performance gasket seal

Technical field

The utility model relates to a kind of pad that still has good seal performance under the lower situation of flange pressure.More particularly, pad of the present utility model can be used in seal fluid.Pad of the present utility model, when being positioned on the flanged surface that needs seal fluid, it can seal up liquid, prevents liquid from the pad internal leak, can prevent that liquid is from the outside seepage of interface between pad and flanged surface simultaneously.

Background technique

Pad is the liquid that is used for canned motor.In order to make pad obtain good sealing property, relevant industrial market has adopted the difficult measure of multiple solution sealing.

At gasket surface additional seal line is the technology of knowing in the sealing gasket industry.The sealing line is the zone of a projection on the pad face.But the sealing line does not extend across the edge of pad, and does not extend on the edge yet.The sealing line only is used to improve sealing.

In No. 5240766 patent of the U.S. gasket material that has the excellent sealing ability under a kind of high temperature condition has been described.This reference has been described a kind of plane gasket material that contains fiber, packing and binder.According to this reference, the composition of the packing of selecting for use provides comparatively desirable sealability.

Although pad just is being widely used in the liquid in the canned motor, make gasket material obtain good sealing property is a problem that is not easy to solve always.Many pads can not carry out good sealing under the lower situation of flange pressure.Then is furnished with dip coating on some other pad, so that pad can good seal.If but the pad compression resistance is bad, then this dip coating is exactly the reason that causes this situation.

Pad of the present utility model can carry out excellent sealing under the lower situation of flange pressure.Pad of the present utility model has the ability that the opposing flange pressure destroys pad simultaneously.

The model utility content

The utility model provides a kind of can solve the technical problem that can not carry out excellent sealing under the lower situation of flange pressure.

For realizing above-mentioned technology, the utility model adopts following technological scheme:

A gasket seal comprises two opposition table planes that cardinal principle is parallel up and down, also have one to place two table surfaces, interplanar limit, the surface, limit is meant the surface of pad inner edge periphery, also be and each vertical substantially limit face in table plane, it is characterized in that present invention resides in the surface, limit be furnished be wider than the limit face and with the seal coating of limit face opposing parallel, this coating can be given prominence to the table plane of crossing at least one pad with the distance of a thousandth English inch, and to extend across the table plane perpendicular to the direction of showing the plane, described coating will cover each part of inside rim face.

Preferably, described pad has at least the table plane can be through angle between inside rim surface and angle plane.

Preferably, the angle between inside rim surface and angle plane is crossed on described pad neither one table plane.

Preferably, the described pad coating inside rim surface of cover part only.

Preferably, described pad coating covers whole inside rim surface.

Preferably, described pad coating extends across up and down two table planes one of percentage English inch at least of pad.

Preferably, described pad coating is a high molecular polymer.

Preferably, described pad is a kind of gasometer pad of energy sealing gas.

Preferably, described pad is the industrial flanged surface pad of a kind of energy sealed steam and/or chemical substance.

Preferably, the coating that described pad is coated in the inside rim surface is by the macromolecule that can seal machine oil or gear lubricant, and macromolecule is the polymer that contains acrylic or acrylonitrile group.

Preferably, to be positioned at the coating on pad inside rim surface be chloroprene polymer to described pad.

Preferably, described pad cladding material is to select from following macromolecule, macromolecule comprises polyacrylic acid, polyacrylonitrile, polyvinylidene chloride, silicon-fluorine polymer thing, polyurethane (PU), nitrile butadiene rubber, fluoropolymer polymer, hydrogenated nbr, silicone rubber, styrene butadiene rubber, fluorine rubber polymer, fluorosilicone, acrylic acid acrylonitrile polymer, carboxyl butyronitrile polymer, carboxyl styrene-butadiene polymer, neoprene polymer, ethylene-propylene rubber polymer, ethylene/vinyl acetate, epoxy.

Preferably, the described coating of described pad extends across each table plane of pad.

Preferably, the outer rim of described pad exists an exterior rim surface at two table interplanars, and described exterior rim face centers on pad and vertical substantially with each table plane of pad according to the outer rim circumference

, the exterior rim surface also be furnished with the exterior rim of being wider than surface and with the coating of this surface opposing parallel

, this coating can be given prominence to and be crossed at least one pad table plane, prominent thickness more is at least about more than a thousandth English inch, prominent more coating and extend across the table plane with direction perpendicular to the table plane.

Preferably, the coating that described pad is positioned at pad inside rim face broadens along outwards stretching gradually perpendicular to the direction of inside rim face substantially, thereby on each limit of coating, having formed an inclined-plane, the table plane and the inside rim face of the bottom on each inclined-plane and pad adjoin.

Preferably, the surface of described pad is furnished with anti-stick coating, but has at least the surface of part not apply anti-stick coating because of the relation that will dispose seal coating.

Preferably, the inside rim finishing coat of described pad can extend across each table plane, and the prominent coating thickness that surpasses the table plane more is about 5/1000ths English inch to percent, eight English inch not to be waited.

Preferably, pad comprises the parallel and table plane of opposition of two cardinal principles, also having one places each to show interplanar exterior rim surface, the exterior rim surface centers on pad and vertical substantially with each table plane according to the outer rim circumference, the exterior rim surface also be furnished with the exterior rim of being wider than surface and with the coating of this surface opposing parallel, coating can be given prominence to and be crossed at least one table plane, the prominent thickness that surpasses the table plane more is about more than a thousandth English inch, coating extends across the table plane with the direction perpendicular to the table plane, described pad is the compressible and permeability of tool also, and pad exterior rim surface has many cavernous structures that can be sealed by the outer rim coating penetration.

Preferably, described pad has at least one table plane can be through angle between between exterior rim face and angle plane.

Preferably, described pad coating extends across the face angle on each table plane of pad.

Preferably, described pad coating covers the whole exterior rim of pad surface fully.

Preferably, described pad neither one table plane is by the angle between exterior rim surface and angle plane.

Preferably, described pad coating is a high molecular polymer.

Preferably, described pad coating is acrylate copolymer or acrylonitrile polymer.

Preferably, to be positioned at the pad coating on exterior rim surface be chloroprene polymer to described pad.

Preferably, described pad is a kind of gasometer pad of sealing gas.

Preferably, described pad is the pad of the industrial flanged surface of a kind of sealed steam and/or chemical substance.

Preferably, described pad cladding material is to select from following macromolecular material, macromolecular material comprises polyacrylic acid, polyacrylonitrile, polyvinylidene chloride, fluorosilicone, polychlorostyrene base Ethyl formate, nitrile butadiene rubber, fluoropolymer polymer, hydrogenated nbr, silicone rubber, styrene butadiene rubber, fluorine rubber polymer, fluorosiloxane copolymer, acrylic acid acrylonitrile polymer, carboxyl butyronitrile polymer, carboxyl styrene-butadiene polymer, neoprene polymer, ethylene-propylene rubber polymer, ethylene/vinyl acetate, epoxy.

Preferably, described pad exterior rim coating can extend across the table plane, surmounts about 5/1000ths English inch to percent of the thickness eight English inch of the coating of showing the plane etc.

Preferably, described pad exterior rim coating can extend across the table plane, and one of the about percentage of thickness English inch to the percent eight English inch that surmount the coating of showing the plane do not wait.

Preferably, described pad exterior rim coating can extend across each table plane.

Preferably, described pad has the anti-stick coating that does not dispose the sealability coating in the part of pad at least.

Gasket seal generally is to be vertical angle and to place two interplanar inside rim faces of table to constitute with the flat facade of table of opposition substantially by the table plane of two opposition and one, and this limit is also referred to as " inside rim " or " pad inside rim " hereinafter.The utility model is included in the pad inside rim and is arranged to a rare obstacle, and this obstacle can liquid barrier pass the inside rim face from the inner edge position of pad or cross inside rim and outwards seepage outflow.This obstacle can be from the table plane of the inside rim of pad or pad projection.When obstacle during from pad inside rim projection, it will broaden to extend gradually perpendicular to the direction on a pad table plane, and pass through an angle plane arrive between pad corner and inside rim certain a bit.This obstacle has enough width, can liquid barrier flow to the pad face from inside rim, therefore, when obstacle had enough width and can give prominence to the inner edge corner of crossing pad, its sealability will be better than another pad its inner rim obstacle and only be limited to the inside rim face (being the inner edge between the corner up and down that obstacle coverage only limits to pad) that covers.

In the most of embodiments relevant with the utility model, above-mentioned obstacle is to be made of a coating.Coating is wide than the thickness of pad inside rim, and the width of coating is meant along the direction that is parallel to the inside rim face, from the distance between the wideest the wideest point to coating between another surperficial and inside rim face of pad of the coating between table plane of pad and inside rim face.The coating that is positioned at inside rim is during if any enough width, and coating can and be passed through aforesaid corner, at least one place with the distance of the direction projection a thousandth English inch that is parallel to gasket surface.The width that the sealing of this pad will be better than another pad its inner rim coating when the coating of pad inside rim is passed through the corner of above-mentioned pad with sufficient amount only terminates between two corners at the inside rim face.Certainly, the inner edge coating set forth of model utility can optionally (be selected or not select) more prominent and walk around the corner and be covered on the table plane of pad.

Be positioned at the coating of pad inside rim, can pass through outstanding at least one corner between inside rim face and boundary, pad table plane.This coating is designated hereinafter simply as " broadside coating " or " outstanding coating ".The corner be meant in the upper and lower surface layer of pad arbitrary with the inside rim face adjoin a bit.For the method for distinguishing this point, because of the inside rim face is to form by cleavable spacer, so the inside rim face can present more cavernous structure than the table plane of pad usually.So relatively the cavernous structure of face can be identified the boundary between face and face, thereby identify the position of this point.

In certain embodiments, pad can be furnished with outstanding coating (" coating C ") along its outside edge.This coating belongs to the auxiliary seal point, and coating C can prevent that liquid from crossing the outer rim of pad and flanged surface and outside seepage.But itself is not preferred in the coating that is positioned at pad inside rim face, because the coating of pad inner edge surface is the interface that directly contacts with liquid, so be the primary position of gasket seal.The edge coating (" coating C ") that is centered around the pad outer perimeter must be able to be given prominence to and pass through at least one pad corner, if in an embodiment the corner face of the table plane of pad and pad do not belong to same aspect then the exterior rim coating preferably can give prominence to the table plane of passing through this pad.

The outstanding coating that pad is furnished with may extend to arbitrary or two table planes, also can further extend arbitrary or two table planes until whole covering pads, and coating must prominent be shown the plane more and be not only smooth coating on the pad with the obstacle that forms anti-leak.Can projection pass through the angle plane of gasket edge or table during the plane when the inside rim coating, this coating has just formed an obstacle, crosses inner edge with liquid barrier from inside rim, flows through the interface layer of gasket surface and flanged surface and outside seepage.In other words, when the inner edge coating of pad is the circumference limit of pad inner edge, outstanding coating can prevent that liquid from flowing out to flanged surface from gasket edge.

In addition, although the pad that existing model utility goes for having comprehensive coating, make it possess more excellent sealing performance, in embodiments more of the present utility model, in order to keep the ability of pad opposing compression failure, its coating should only limit to cover the part in the pad, and remaining part then is not furnished with coating.In the embodiment of the type, the broadside coating is that sealing pad inside rim face stops liquid to pass through shim body and the method for optimizing of outside seepage.Preferred embodiment is, in order to keep the ability of pad opposing compression failure, it is about 50% that the area coverage that coating covers subpad sheet surface layer should remain on, or to be more preferably the greatest measure that limits the coating area coverage be 30% of pad.In the preferential embodiment who recommends of another kind, all there is not coating in the upper and lower surface of pad, so that pad obtains the ability of best opposing compression failure.

Opposing compression failure ability is the ability that a kind of renitency that gasket construction has is avoided deformation failure.Compression test be a kind of between industry the detection mode of generally accepted opposing compression failure.Pad the degree of the opposing compression failure that must possess usually by its load setting that under a certain special application or specific flanged surface, is born.

Correspondingly, be coated with all parts that the coating that is added on the pad inner edge must cover the inside rim face, so that pad obtains good seal performance.If but have the complete impermeable zone of liquid at edge or pad, then coating and nonessential being added on this zone such as the bolt zone.Being coated on the coating of pad inner edge, mainly is to make pad that better sealability can be provided.Effectively the coating amount depends on the requirement of gasket seal application performance, for example, if 75% the pad inside rim face of applying can reach the requirement that gasket seal is used, the coating amount that then applying 75% pad inner edge needs is effective coating amount, but preferred coating amount is the coating that can cover whole pad inside rim face.

The utility model beneficial effect is for adopting the pad of said structure, still can carry out excellent sealing under the lower situation of flange pressure.

Description of drawings

The utility model file is with Fig. 1 to Fig. 7 seven width of cloth figure.

Fig. 1 is the gasket part partial cross-section figure that the gasket edge face is furnished with coating;

Fig. 2 is the pad sectional view that the pad inner edge is furnished with coating;

Fig. 3 is the pad sectional view that the pad inside rim is furnished with coating;

Fig. 4 is furnished with inner edge coating limit and the part gasket surface is furnished with the pad plan view of coating;

Pad sectional view shown in Fig. 5 Fig. 4;

Fig. 6 is a pad sectional view of being furnished with coating in the pad inside rim; With

Fig. 7 is the sectional view of pad inside rim or inner edge circumference, and the inner edge surface of pad disposes the inner edge coating.

Fig. 1 is the pad partial cross section figure that other width of cloth is furnished with the coating inside rim. Coating limit face substantially with pad on the following table plane perpendicular. This figure has shown and has partly joined cated pad rim. Similarly, in the drawings, between the every one side of pad and join between the cated pad inside rim the angle in pad top and bottom respectively as seen. Coating is to be parallel to pad inside rim face, stretch from the direction of corner to another corner, its width is wider than the inside rim face of pad and has been crossed each corner, and in fact its width enough makes coating dash forward to cross and cover the table plane that pad adjoins with the pad inside rim up and down. Coating shown in the present embodiment is not extended and is covered in arbitrary pad table plane. The inner edge coating that is positioned at each pad limit stretches out gradually and broadens, width greater than the inside rim face of pad until reach certain a bit. Pad shown in the present embodiment can provide the performance of different brackets, do not wait from good seal performance to complete sealing property, and in view of the table plane of pad does not have any dip coating that is enough to reduce the pad compressive property, cause pad to possess again the ability of the opposing compression failure of best (the most desirable) simultaneously. This coating is a kind of acrylic latex.

Fig. 1 is that gasket edge (71) is joined the diagram of cated amplification pad partial cross section. The edge coating of this pad basic with pad about (15 and 30) table planes (30 and 35) vertical, and this coating has enough width, can cross the table plane (34 and 35) that is positioned at both sides about the pad. The table plane that No. 34 planes herein and No. 35 planes are pad also is the angle plane of pad, and angle plane refers to pass through between the table plane of pad and joins the plane at the angle between the cated gasket edge. Coating is being prolonged the direction of leaving the edge and is outwards being enlarged gradually from gasket edge (71), and the coating on following table plane on the pad is wider than in formation one. So the liquid that flows through pad table plane has been formed a kind of obstacle that stops liquid outflow. This embodiment (demonstration is also arranged in Fig. 1) is preferential embodiment of the present utility model.

Fig. 2 is the partial cross section amplification diagram that pad inside rim (72) is joined cated pad. Coat side is substantially vertical with pad table plane (17 and 31). Coating among the figure (18) is parallel with the inside rim face of pad and enough width are arranged, so that can cross corner and the pad table plane (54) that is positioned at inside rim face top (72). Table plane (54) shown in this figure and angle plane (mark) are not at grade.

Fig. 3 is the pad partial cross section figure that is furnished with the inside rim coating. Shown in the cross section that pad joins the part of cated inside rim face, basic the table plane of balance is vertical up and down with pad for pad inside rim face as shown in the figure, and as seen the angle of joining between cated inside rim and the pad table plane is distinguished at pad top and bottom. The coating parallel with the inside rim face, its width not only should be big than the inside rim face of pad, and the while more should be able to cover and surpass the table plane of pad and the corner between the inside rim face, and in fact at least pad table plane on one side should be able to protrudingly be got over and surpass to the width of this coating. This coating is the silicone rubber coating.

Fig. 3 is the partial cross section amplification diagram that pad inside rim (75) is joined cated pad. This inside rim (claiming again " inner edge surface ") is substantially vertical with the up and down contrast surface (24 and 32) of pad. Coating (26) projection is crossed and is positioned at up and down " table plane " or " angle plane " (37 and 38) on both sides of pad. " table plane " and " angle plane " are same plane herein.

Fig. 4 is pad (10) diagram that the table plane of being furnished with coating inside rim (12) and part pad is furnished with coating (11).

Fig. 5 is the partial cross section figure of other width of cloth pad of being furnished with the coating inside rim. Shown among the figure and partly joined cated pad inner edge. It is substantially vertical with the upper and lower surface of pad to join cated pad inner edge surface.

As shown in Figure 5, the coating that is parallel to pad inside rim face is generally wide than the thickness of pad itself, in fact as shown in this embodiment, the width of coating can enough dash forward pad inside rim more the corner and surmounted the table plane on the up and down both sides of pad. Coating of this protruding more gasket surface makes the sealing property of pad only be better than the sealability of the coating that maintains an equal level with the arbitrary table of pad plane, this is because protruding coating of getting over can form in the inside rim of pad an obstacle, passes through gasket surface and outside seepage with liquid barrier from inside rim. Coating shown in the present embodiment can also be extended on the table plane that is covered to the pad both sides in fact. This coating is a kind of acrylic latex.

Fig. 5 is the amplification sectional view of pad shown in Figure 4. As shown in the figure, the position that inside rim coating (12) applies is the inner edge surface (76) of pad, and its extension (11) cover on the table plane that arrives pad (25). The table plane and the angle plane (39 and 65) that have also shown pad among the figure. Coating is with prominent table plane and the angle plane of crossing pad of the direction that is parallel to inside rim face (76). In some performance preferred embodiments, the jut of coating exceeds at least one thousandth English inch than pad table plane shown in Figure 5. In Fig. 5 as seen, be parallel to the coating of inside rim face with the direction extension away from inner edge surface, this inside rim finishing coat also adds that than pad the gross thickness of the coating that is covered in upper following table plane is wide from pad one side to the thickness of the Width pad of pad another side itself is wide. Equally in Fig. 5 as seen, also extend and crossed the table plane (25 and 33) of pad as the Barrier Coatings of liquid barrier seepage effect. In addition, as seen from Figure 5, the Barrier Coatings that plays the effect of liquid barrier seepage on following table plane on the pad is to be covered on the table plane of pad with the angle of low dip slightly.

Fig. 6 is the part pad cross section amplification diagram of being furnished with coating (41) at pad inside rim face (77). This coating projection is crossed the corner between table plane (40) and inside rim face (77), thereby crosses the corner face, but coating does not extend across pad table plane (36). This is positioned at the obstacle that pad inner edge coating on one side provides an outside seepage of barrier liquid, although obstacle is not high, also being different from coating for example shown in Figure 3 can be as far as crossing face (24). If but not having this obstacle, liquid can be from inner edge flow through pad table plane (40) and outside seepage.

Fig. 7 is a pad sectional view that is exaggerated, comprising the pad inside rim face (78) of being furnished with coating (48) and pad outside or circumference (47). This pad contains from the potted line of gasket surface projection (46) and is lower than the face territory (49) on pad table plane. This face territory can consist of with the embossing mode. Coating (48) extend projection cross be " table plane " be again the plane (60) of " angle plane ". Pad table plane (44 and 45) has shown and has had the face territory that the potted line by embossing and protrusion consists of concurrently. Can see that from diagram table plane (60) is the plane that extends into the another side of pad from one side of gasket surface through pad. Table plane (60) also comprises the smooth part of gasket surface and Jie and joins angle between cated pad inner edge (78) and gasket surface (45).

Can effectively hinder or stop liquid to cross pad table plane and outside seepage in the protruding more coating of gasket surface of the additional one deck of pad inner edge. That is to say that coating makes this pad reach the effect of improved seal by forming a kind of obstacle at pad inside rim face. And the prominent part of crossing gasket surface of the pad inner edge coating major part of this obstacle especially, it is the preferred barrier of the outside seepage of liquid barrier.

Add an attached coating at the inner edge of the cushion film that contacts with liquid and can produce outward seepage of banding effect and liquid barrier, thereby reach the sealing effectiveness of pad. Surprisingly, add attached this coating and to the significant improvement of the sealing property of pad, do not need to change the composition of gasket material. The improvement of gasket seal performance is because added this coating at the pad inner edge fully. Equally surprisingly, in many cases, basic pad itself need not to possess significant sealing property at all. In addition, the basic pad that possesses inner edge coating sealing property is done under the situation of any change in addition need not, can compatible integration with dissimilar flange faces.

Any gasket material that can seal fluid all can be by thisUtility model and obtain the benefit of improved seal performance is comprising the pad of being furnished with face coat or surperficial uncoated pad; Such as cushion film material or stacked pad, be included in the pad that two interlayers add compressible or incompressible central layer, on one side or add the pad of incompressible substrate at pad. Among the embodiment, when pad during more than one deck, prominent more the inside rim coating or only can be coated on the material of simple layer in the base mat chip architecture. Preferably the prominent more coating of inside rim face can cover the structure at all levels of pad inside rim face fully, and coating can be extended the prominent corner that at least one place is made up of pad plane and inner edge surface of crossing. Another is coating porous and seal any layer and slit of interlayer of being present in also preferably.

In certain embodiments, aforementioned obstacle by the inner edge coating formation extends with the direction of showing the plane perpendicular at least one, and passes through the corner between between pad table plane and inner edge surface. By the obstacle of inner edge coating formation, can extend across the corner among some embodiment, most preferred pad is to have the more inner edge coating of upper and lower surface corner of dashing forward, and as Fig. 3 and shown in Figure 5, the levels table plane of pad all has the prominent more coating that forms obstacle

But to the pad of some embodiment, its performance possesses compressibility, and its structure is poroid, and the application of pad needs liquid barrier to penetrate pad inside and outside seepage, and then pad of the present utility model is ideal. In this case, can give pad more good sealing property in broadside coating of pad inside rim configuration, this broadside coating needs can cover the corner of upper and lower surface layer and can more surpass angle plane to dash forward perpendicular to the direction on table plane, make coating live whole inside rim face by complete clad, so, pad can seal up by the pad internal layer the outwards liquid of seepage, also can seal to cross that inside rim flows through superficial layer and the outside liquid of seepage.

Gasket material is made in the process of pad product in cutting processing, and the sealing property of the broadside pad that coating is given of inner edge will be especially remarkable. Be to having cavernous structure and compressible pad by it, the inner edge surface that forms by cutting will be than more coarse without the gasket surface of cutting and have a more opening structure. Can make coating penetration and fill these holes in inside rim configuration coating, enable to stop up the inside rim face and the whereby endosome of liquid barrier infiltration pad and outwards outflow. Utility model can be used in any gasket material that possesses the internal structure of permeability, and the technology of making these gasket materials includes but not limited to latexes collecting technology, calendering technology, extrusion process, molding process, wet-formed process structure. The composition of these gasket materials can be made up of following material, includes but not limited to composite fibre materials, contains material, foaming structure or the lamellar structure etc. of composite material, high molecular polymer mixture, rubber material, graphite or the graphitiferous of filler or binding agent.

The cushion film material is more suitable for the use of broadside inner edge coating of the present utility model. The composition of being permitted eurypalynous cushion film material comprises fiber and binding agent, and the cushion film material of other type comprises binding agent and filler (filler), for example cork-rubber gasket material. Many cushion film materials comprise fiber, binding agent and filler. The internal structure of such a cushion film material much is pore structure slightly, and after cutting processing, these microcellular structures can show at cut surface (inside rim face). Because liquid can pass through the outside seepage of these micropores, so these micropores are harmful to the sealing property of pad, therefore, add an attached coating in the pad inside rim, this coating can be permeated or is packed at least the micropore of inside rim face and reach the effect of sealing. In certain embodiments, above-mentioned inside rim face also can be the inner edge of bolt hole.

In most of the cases, when fibre-bearing in the gasket material and binding agent, its composition also can contain filler simultaneously. Pad should contain the binding agent of at least 1% weight and the fiber of at least 5% weight, also can add to be no less than 1% filler. The appropriate level of gasket material is; Weight of binder: 3%-40%, fibre weight: 5%-70%, filler weight: 1%-92%.

The first-selected range of application of the inner edge coating of the utility model introduction comprises: the Oil pan gastet of inlet manifold pad, salable machine oil and gland shim for example seal the valve gap of machine oil and the shaft-cup of sealing gear lubricant; Also comprise the gasket of compressor that often is exposed to such as refrigerants such as fluorine Lyons; The gas gauge pad of sealing gas; The suction pump pad of sealing water and antifreezing agent; Industrial sealing edge pad of sealed steam and/or chemical substance etc. In view of dissimilar coating materials to the sealability of different liquids and different, thereby for the sealing effectiveness that makes embodiment reaches best, the types of coatings of each Analysis is most important. In fact, our Seal Design of finding inner edge broadside coating shockingly is fit to the sealing to air and flammable fuel combination of the vacuum system of the sealing of the food tray of diesel engine and inlet manifold. Neoprene and acrylonitrile-butadiene rubber are the first-selected coating of the pad embodiment that contacts with refrigerant; Acrylic rubber and acrylonitrile-butadiene rubber are the first-selected coating of the embodiment coating that contacts with machine oil class and gear lubricant.

A corner of adjoining with pad table plane is arranged respectively two ends up and down at pad inside rim face. Each angle can be regarded as being in two differences and on the unlimited parallel plane, for example

No. 39 planes and No. 65 planes among Fig. 5. When this plane when smooth gasket surface communicates, this plane just is equal to " the table plane " of pad, this plane thereby just be contained in the smooth zone of gasket surface. In general, inside rim is vertical with the table plane of pad at the inner edge surface of pad inner edge periphery substantially. When being on the table plane at pad the time between the angle between pad table plane and the inside rim, this pad table plane " angle plane ". In some cases, table plane and without the inside rim angle, on existing unlimited " the table plane " of which kind of situation lower gasket, also have unlimited " angle plane " and deposit, for example the table plane of No. 54 shown in Fig. 2 and figure

Angle plane shown in 6 (80) and table plane (36). That is to say can be by between the angle of this plane and inside rim the time when the table plane of pad, and this plane has also just become angle plane and table plane simultaneously, i.e. " angle, table plane ". When the inner edge coating extended across between angle between the plane of inside rim and table, the inner edge coating will be dashed forward and more be passed angle plane, and coating as shown in Figure 6 (41) is the same. For making pad that the performance of excellent sealing liquid can be arranged, the inner edge coating must be dashed forward and more be passed angle plane, otherwise liquid will flow into the interface space between between gasket surface and flange face, and outside seepage.

In some more preferred examples, the corner by inner edge surface not when the table plane of pad, in these cases, if can dash forward simultaneously more above angle plane and table plane from the coating that inner edge surface extends, so, this inner edge coating can provide an obstacle that more is better than liquid barrier, make the more difficult inflow of liquid between between pad table plane and flange face the space and outside seepage. " the inside rim thickness " mentioned in this specification mean on the inside rim face, is positioned at angle between table plane and inside rim to the distance that is positioned at another angle between another table plane and inside rim from one. Thereby in order to stop liquid to make pad obtain best sealing property from the gasket surface seepage or by the outside seepage of shim body, inner edge coating of the present utility model should be wide than the thickness of inside rim face, so that the inner edge coating in the following table plane, can be dashed forward at least and cross the wherein angle plane at a place on pad.

In most of the cases, the table plane of pad and angle plane are same. Yet in the situation of some pressurizeds, table plane domain may crowdedly enter or become another plane different from original table plane because being subjected to. When this situation betided the inside rim of adjoining with the table plane of pad, the angle between table plane and inside rim may become not obvious, therefore will confirm that the actual location of angle plane just can become very difficult. In this case, judge that the position of angle plane can be carried out with the method for the end points of identifying the inside rim face that forms through cutting, because the position of this end points is positioned on the angle plane exactly. The inside rim face that was cut in addition contains usually than the more opening structure in pad table plane, and the identification inner edge surface can be recognized easily by the cross sectional shape that compares pad.

Below abbreviation is positioned at pad inside rim face coating layer portion (such as Fig. 1, Fig. 3, Fig. 6, shown in Figure 7) be the A coating. Show among the embodiment of Fig. 5 except the A coating that is positioned at pad inside rim face, extend across the corner in addition in addition and cover coating on the table plane of pad. Thereby when coating extended to the table plane that is covered in pad, this coating layer portion that covers on the table plane can be called as the B coating, as shown in Figure 5; The A coating then only refers to be positioned at the coating on the pad inside rim face. Another one is similar to the A coating, but a coating distance below will be simply referred to as the C coating in the coating of the outer edge surface of pad periphery. When the C coating extended across and be covered in the table plane of pad, it had just become the B coating. More preferably situation is, the A coating can extend across the B coating, crosses the B coating surface on pad plane at least on one side to give prominence at least about the width of one thousandth English inch; Better situation is, the A coating is crossed the B coating to give prominence at least about the width of 5/1000ths English inch; Best situation is, the A coating at pad at least on one side with at least about the outstanding B coating of crossing of the width of one of percentage English inch. Prepreerence selection is that the B coating can be given prominence to and cross to the A coating simultaneously at the pad upper and lower surface. When the A coating extended across the corner that is positioned at the pad inner edge (therefore also outstanding and cross angle plane) or A coating and extends across the B coating, the prominent coating of getting over of this extensions can be called as " lip structure " or " lip ". Also this " lip " formed a kind of obstacle to intercept the outside seepage of liquid that contacts with inner edge surface.

The pad of in the utility model, setting forth be a pad within it week inside rim around be covered with one with the upper following table plane of pad vertical broadside coating substantially, this coating is parallel with the inside rim face and can cross at least one between showing plane and an interior intermarginal corner. This coating applies and crosses another corner that is positioned between another table plane and inside rim from a corner that is positioned between a table plane and inside rim. Should prominent coating must have enough width, so that this one has the prominent more pad of coating, compared to the pad of another inner edge coating, a width only has the pad that arrives the distance of another angle straight angle from an angle plane, and better sealing property is arranged.

Proportionately, on same problem, angle plane be given prominence to and be crossed to the coating obstacle of pad inside rim should with the distance at least about one thousandth English inch. Width distance from one jiao of coating to another angle will be therefore at least than the roomy about one thousandth English inch of thickness of pad inside rim. People more find, one can make pad reach more good sealing property than this thicker Barrier Coatings. Therefore better situation is, this Barrier Coatings can be crossed angle plane to give prominence at least about 5/1000ths English inch. Proportionately, this Barrier Coatings should be with not equidistant the cross angle plane of one thousandth English inch to about 8 percent English inch. Therefore the arbitrary of pad or two angle planes up and down not given prominence to and be crossed to the broadside coating should be able to about one thousandth English inch to about 8 percent English inch equidistant. Distance range should be from about 5/1000ths English inch to about 8 percent English inch preferably, is more preferably the outstanding angle plane of crossing of distance that coating does not wait with one of about percentage English inch to about 8 percent English inch. Situation is preferably, and the broadside coating can be flat with prominent at least one angle of crossing of the distance of one of about percentage English inch; Preferred situation is that the broadside coating can be with prominent more above each angle plane about the inside rim face at least about the distance of one of percentage English inch. Fact-finding, its sealing property of pad that disposes this coating can reach excellent or complete hermetic outstanding usefulness. Even under lower flange can the application scenarios of pressure, for example at about 300PSI and above or about 25PSI and when above, its sealing function also was equally remarkable. When prominent more coating fully liquid barrier infiltrate inside rim and pass through pad table plane simultaneously can liquid barrier by shim body and outwards during seepage, the complete hermetic usefulness of pad just can reach, in order to reach such sealing, the broadside coating preferably can be with outstanding each angle plane of crossing of distance at least about 15/1000ths inch.

A bead coating pad that has complete sealing property, its be positioned at coating on the inside rim preferably can be from the inner edge corner of pad with the table plane that is parallel to pad and away from the direction of inside rim broaden gradually (such as Fig. 1, shown in Figure 5), to form a tapered plane, until arrive and the coating the widest point of inside rim at a distance of a segment distance. Coating is unimportant from the distance that inside rim extends to its widest point. Yet proportionately, among the such a embodiment, coating should be than at least wide one thousandth inch of the thickness of pad inside rim. Better, coating is than at least wide 5/1000ths inch of the thickness of pad inside rim. More preferably, the prominent more coating of pad inside rim can form " lip " as shown in Figure 3, or as shown in Fig. 1, Fig. 5. (" lip " among Fig. 1, Fig. 5 is the individuality of a similar tapered plane, and stretches out and the coating that broadens gradually consists of from the pad inside rim by one).

In an example, the angle between between table plane and inside rim face is not passed through on the table plane of pad, and ideal is that the inner edge coating can form the obstacle giving prominence to and cross the table plane in this case. Proportionately, should enough coating amounts need be arranged the prominent Barrier Coatings that more surpasses the table plane, the superior sealing property that being pad provides can more be better than the pad that another kind contains the inner edge coating, and its coating only is confined to the following table interplanar at the coverage rate of inside rim face, but does not pass through the table plane. The table plane that should prominent more coating should be able to give prominence to and cross pad is one thousandth English inch at least; Be preferably, such a table plane at least thousand/five English inch can be extended and cross to coating; Be more preferably, at least one of percentage English inch of a such a table plane can be extended and cross to this coating. Situation is preferably, this Barrier Coatings can be with the distance of one thousandth inch at least outstanding at least one table plane that surmounted; Better situation is, obstacle can be given prominence to the distance of 5/1000ths English inch surmounted at least one table plane at least; Also to good situation be that obstacle can be given prominence to the distance of one percent English inch surmounted at least one table plane at least; The distance of crossing pad table plane in coating is no less than under the situation of 15/1000ths English inch, and inner edge coating pad once must be in test the fully result of sealing; The preferred coverage of Barrier Coatings of the present utility model is (to comprise Fig. 2 with about 5/1000ths inch to outstanding at least one table plane of crossing of the distance of percentage eight inch, shown in the example of Fig. 6, the position on table plane is on the angle plane of pad or outside the angle plane). Better embodiment is that the obstacle of this coating form can extend and cross the table plane that is positioned at the pad upper and lower surface.

Coating can be coated on the pad in any film forming mode, modes such as dipping, fusing, japanning, spray-on coating, serigraphy or die, but the inside rim of any part for the protection of pad can not have coating to cover.

In the pad of some embodiment, the part inside rim may need not consciously to add attached coating material so that in whole inside rim face, only have the part the inside rim face be add cated. This situation is near bolt when zone in inside rim especially, and is the most suitable. When inside rim was about or is less than 3.5 centimetres apart from bolt, the inside rim at this place did not add the compressive property that attached coating more can keep pad. Therefore in addition, the pressure that turnbuckle adds to this spacer region can give pad extra sealability, and the inside rim in this bolt zone adds that to cover coating may be not need even minus effect arranged. Realize such as the described situation of this example, before inside rim adds attached coating, can mould sheet one of uncoated partial configuration in advance. But when pad need liquid barrier flow through pad inside and during to exosmosis, the marginal portion that coating material must contact pins makes coating fully cover the inside rim face from an angle to another angle of inside rim. About above-mentioned bolt zone, refer to a close bolt or the spacer region that is covered by bolt, there, the pressure that pad affords can be higher than the zone away from bolt.

The said coating of the utility model can add and overlays on any limit face vertical with the upper and lower surface of pad, comprises the limit face of pad outer perimeter. The composition of coating both can be organic material, also can be inorganic material. Yet, when using, be liquid if need the medium of sealing, especially effective with the coating material of high molecular polymer, also be highly preferred.

To be the B coating add on up and down two or the arbitrary table plane that is attached to pad with the strip body another kind of possible way along inside rim, the B coating of this strip needs to adjoin with the corner perpendicular to inner edge surface, and adjoining mutually with the coating (A coating) of pad inside rim face equally, even combination. Integration situation between flange face is not good, can not be close to mutually to form one can the outside seepage of liquid barrier the situation of appropriate seal under, use this stripe coating the most favourable. For example, if flange face is warpage, even if be slight warpage, enable mutually complete compatible integration so that can not form a flat surfaces. In this case, use the better sealing property of anti-fluid seepage of stripe coating energy effective supply. When running into so application scenarios, stripe coating will preferably be contained in the inside rim that contacts of liquid and be used.

The coating of pad inside rim face (A coating) can dash forward more cover pad about on (or arbitrary) table plane, form the B coating. The expanded range of B coating overlay area does not wait, and can be the trace of not enough one thousandth English inch, can extend the table plane that covers whole pad yet. And coating that cover pad table plane vertical with the inside rim face can only be covered in arbitrary surface on following table plane on the pad or two sides (as shown in Figure 5) simultaneously. Be preferably, gasket seal can extend about 1.5 centimetres on pad table plane. The maximum of more preferably, extending the B coating cover pad table plane is about five millimeters. Most preferably, the extension maximum of B coating is 1 millimeter. The embodiment here will obtain the sealing effectiveness of the best with the coating of minimum at gasket surface, but can keep best crushing resistance simultaneously.

If possible, the table plane of pad does not preferably dispose any coating that can help sealing property, or only disposes anti-stick coating, or only at part surface configuration anti-stick coating, can be so, pad can obtain better crushing resistance. In general, anti-stick coating is basically little to the compressive property impact of pad. Be added in the common not enough one thousandth English inch of thickness of the antitack agent of gasket surface. For improvement of the coating of gasket seal performance, such as dip coating, its consumption heavier, thicker that antitack agent uses that compare. Generally can penetrate into simultaneously the internal layer of gasket material for increasing the face coat of sealing property, the anti-pressure ability of pad is reduced, so in the application of focusing on compressive property, and be not suitable for.

Fact-finding, the coating of gasket surface, the more thick crushing resistance to pad that adds is harmful. Therefore, in order to keep the compressive resistance of pad, the Breadth Maximum of 11 English inch of width Ying Yiqian branch that covers the coating of pad table planar section in the inside rim coating is good.

In order to reach optimum efficiency, when using antiseized paint, should prevent from not allowing it infiltrate through the endothecium structure of pad as far as possible. Can prevent that antitack agent from infiltrating through the pad internal structure, can prevent that antitack agent from bringing the evil fruit of destroying compressive property to pad.

From the angle of practicality, the coating layer thickness of inside rim (be the thickness of the coating (A or C coating) that is parallel to the inside rim face and perpendicular to coating (B coating) thickness of inside rim face) should be take minimum as good. Fact-finding, the coating vertical with inside rim just is that thickness is very little, but to the sealing property of promoting pad or effectively. In view of quite thin coating just can be received effective sealing result, therefore thickness and the width of coating can be limited to minimum so as to reducing cost on the inside rim face vertical with gasket surface.

Although perpendicular to the inside rim face be parallel to the coating of show plane, its thickness is not that tool is critical to the sealing property of pad, the thickness of coating preferably has 0.1 millimeter at least, and the thickness of maximum can reach about 2 millimeters. Inner edge coating at the inside rim face its role is to gasket seal, crosses over the inside rim of pad and the outside seepage by the surface of pad with liquid barrier from least one table plane of pad. Coating must possess the minimum thickness of energy gasket seal and cross inside rim towards outer seepage with liquid barrier. Proportionately, the seal coating that is positioned at the cushion film edge must reach at least thickness of mil (extending along the direction perpendicular to vertical edges). Better embodiment is the obstacle of the bead coating formation on inside rim, can cross at least one outside seepage in pad table plane with liquid barrier with the prominent angle plane that more surpasses of enough distances, be more preferably this obstacle and can be simultaneously exist with the outside seepage of liquid barrier on two table planes up and down.

Can comprise with the inorganic material of making coatings vermiculite coating and the mica coating that the chemosphere divisional processing is crossed. High molecular polymer coating is highly preferred. High-molecular coating can be in order to form A coating, B coating and/or C coating. The high molecular polymer coating comprises mixed complex organic, inorganic or organic/inorganic and contains the condensate of filler. The high molecular polymer that is suitable for comprises polyacrylic acid, polyacrylonitrile, polyvinylidene chloride, fluorosilicone, polyurethane, acrylonitrile-butadiene rubber (NBR), fluoropolymer polymer, hydrogenated nbr, silicone rubber (comprise with ultraviolet light (UV) and solidifying or cold curing); butadiene-styrene rubber; fluorubber polymer; fluorosiloxane copolymer; acrylic acid acrylonitrile polymer; carboxyl butyronitrile polymer; Carboxy polymer; neoprene polymer; EP rubbers polymer; ethylene-vinyl acetate; epoxy; also can mix and use above-mentioned various macromolecule polymer materials, perhaps use any latex mixture. Be heated the condensate powder that is dissolved in the pad face and be suitable as too coating. In fact, any fusible powder all can be used for sealing and covers pad. A coating, B coating and C coating can be made by the coating of different materials, also can be the coatings of same material.

Embodiment

Cut out two identical annular shims with the wood-fiber mat sheet material, each pad forms a ring, and its size is as follows: inner diameter (inside rim of extremely encircling from the inner edge center of ring) 0.515 English inch; Outer diameter 0.95 English inch; Ring width 0.2175 English inch.Each pad has two relative smooth substantially table planes, and each ring has the inside rim of a cardinal principle perpendicular to the table plane.Inside rim thickness (being spacer thickness) is 32/1000ths cun.

Gasket ring among the sample A does not have coating to cover according to control fully.Among the sample B, acrylic latex is used as the coating of coated gasket ring inner edge surface.This coating covers on the inside rim of pad inner edge, the thickness of coating is than the thickness of inside rim face wide (promptly being wider than spacer thickness), coating and prominent cross each vertical in about 27/1000ths cun of each limit of corner, this size has reached the wideest point of coating.Distance from the vertical inner edge of pad to the coating surface at pad center is approximately 0.9 millimeter.The coating such as the cross section of pad inside rim are shown in Figure 1.

Pad is tested in filling the nitrogen drum casing.Nitrogen in cylinder is pressed and is risen to 14 pounds of every square of English inch (14PSI), and test process mainly is to measure the nitrogen pressure to leak to the required time of 13PSI from 14PSI.Each pad covers the flanged surface of cylinder in advance before the test, and with bolt flanged surface is fastened.The smoothness that is used for the flanged surface of this test is that 18RaMS (Ra refers to average roughness value, and MS represents 1,000,000/English inch) adds the pressure that invests flanged surface PSI (pound/every square of English inch) expression.

In this test, when flange pressure was 2100PSI, the nitrogen that contains the nitrogen cylinder of sample A was pressed and to be fallen (leakage) from 14PSI and take 1.5 minutes to 13PSI.But sample B promptly contains the gasket seal of broadside coating, has kept complete sealing state (pressure in the cylinder remains on 14PSI), and the flange pressure that contains the cylinder of sample B pad is pressed and only is 300PSI.

Claims

1. a gasket seal comprises two opposition table planes that cardinal principle is parallel up and down, also have one to place two table surfaces, interplanar limit, the surface, limit is meant the surface of pad inner edge periphery, also be and each vertical substantially limit face in table plane, it is characterized in that present invention resides in the surface, limit be furnished be wider than the limit face and with the seal coating of limit face opposing parallel, this coating can be given prominence to the table plane of crossing at least one pad with the distance of a thousandth English inch, and to extend across the table plane perpendicular to the direction of showing the plane, described coating will cover each part of inside rim face.

2. according to the pad described in the claim 1, it is characterized in that pad has at least the table plane can be through the angle between inside rim surface and angle plane.

3. according to the pad described in the claim 1, it is characterized in that pad neither one table plane crosses the angle between inside rim surface and angle plane.

4. according to pad described in the claim 1, it is characterized in that the only inside rim surface of cover part of pad coating.

5. according to pad described in the claim 1, it is characterized in that the pad coating covers whole inside rim surface.

6. according to pad described in the claim 1, it is characterized in that the pad coating extends across pad two table planes one of percentage English inch at least up and down.

7. according to pad described in the claim 1, it is characterized in that the pad coating is a high molecular polymer.

8. according to the pad described in the claim 1, it is characterized in that pad is a kind of gasometer pad of energy sealing gas.

9. according to the pad described in the claim 1, it is characterized in that pad is the industrial flanged surface pad of a kind of energy sealed steam and/or chemical substance.

10. according to the pad described in the claim 1, it is characterized in that the coating that pad is coated in the inside rim surface is by the macromolecule that can seal machine oil or gear lubricant, macromolecule is the polymer that contains acrylic or acrylonitrile group.

11., it is characterized in that the coating that pad is positioned at pad inside rim surface is a chloroprene polymer according to the pad described in the claim 10.

12. according to the pad described in the claim 1, it is characterized in that the pad cladding material is to select from following macromolecule, macromolecule comprises polyacrylic acid, polyacrylonitrile, polyvinylidene chloride, silicon-fluorine polymer thing, polyurethane (PU), nitrile butadiene rubber, fluoropolymer polymer, hydrogenated nbr, silicone rubber, styrene butadiene rubber, fluorine rubber polymer, fluorosilicone, acrylic acid acrylonitrile polymer, carboxyl butyronitrile polymer, carboxyl styrene-butadiene polymer, neoprene polymer, ethylene-propylene rubber polymer, ethylene/vinyl acetate, epoxy.

13., it is characterized in that the described coating of pad extends across each table plane of pad according to the pad described in the claim 1.

14. according to the pad described in the claim 1, the outer rim that it is characterized in that pad exists an exterior rim surface at two table interplanars, described exterior rim face centers on pad and vertical substantially with each table plane of pad according to the outer rim circumference, the exterior rim surface also be furnished with the exterior rim of being wider than surface and with the coating of this surface opposing parallel, this coating can be given prominence to and be crossed at least one pad table plane, prominent thickness more is at least about more than a thousandth English inch, prominent more coating and extend across the table plane with direction perpendicular to the table plane.

15. according to the pad described in the claim 1, it is characterized in that coating that pad is positioned at pad inside rim face broadens along outwards stretching gradually perpendicular to the direction of inside rim face substantially, thereby on each limit of coating, having formed an inclined-plane, the table plane and the inside rim face of the bottom on each inclined-plane and pad adjoin.

16. according to the pad described in the claim 1, it is characterized in that the surface of pad is furnished with anti-stick coating, but have at least the surface of part not apply anti-stick coating because of the relation that will dispose seal coating.

17. according to the pad described in the claim 1, it is characterized in that the inside rim finishing coat of pad can extend across each table plane, the prominent coating thickness that surpasses the table plane more is about 5/1000ths English inch to percent, eight English inch not to be waited.

18. pad comprises the parallel and table plane of opposition of two cardinal principles, it is characterized in that also having one places each to show interplanar exterior rim surface, the exterior rim surface centers on pad and vertical substantially with each table plane according to the outer rim circumference, the exterior rim surface also be furnished with the exterior rim of being wider than surface and with the coating of this surface opposing parallel, coating can be given prominence to and be crossed at least one table plane, the prominent thickness that surpasses the table plane more is about more than a thousandth English inch, coating extends across the table plane with the direction perpendicular to the table plane, described pad is the compressible and permeability of tool also, and pad exterior rim surface has many cavernous structures that can be sealed by the outer rim coating penetration.

19., it is characterized in that pad has at least one table plane can be through angle between between exterior rim face and angle plane according to the pad described in the claim 18.

20., it is characterized in that the pad coating extends across the face angle on each table plane of pad according to the pad described in the claim 19.

21., it is characterized in that the pad coating covers the whole exterior rim of pad surface fully according to the pad described in the claim 20.

22., it is characterized in that pad neither one table plane is by the angle between exterior rim surface and angle plane according to the pad described in the claim 18.

23., it is characterized in that the pad coating is a high molecular polymer according to the pad described in the claim 18.

24., it is characterized in that the pad coating is acrylate copolymer or acrylonitrile polymer according to the pad described in the claim 18.

25., it is characterized in that the pad coating that pad is positioned at the exterior rim surface is a chloroprene polymer according to the pad described in the claim 18.

26., it is characterized in that pad is a kind of gasometer pad of sealing gas according to the pad described in the claim 18.

27., it is characterized in that pad is the pad of the industrial flanged surface of a kind of sealed steam and/or chemical substance according to the pad described in the claim 18.

28. according to the pad described in the claim 18, it is characterized in that the pad cladding material is to select from following macromolecular material, macromolecular material comprises polyacrylic acid, polyacrylonitrile, polyvinylidene chloride, fluorosilicone, polychlorostyrene base Ethyl formate, nitrile butadiene rubber, fluoropolymer polymer, hydrogenated nbr, silicone rubber, styrene butadiene rubber, fluorine rubber polymer, fluorosiloxane copolymer, acrylic acid acrylonitrile polymer, carboxyl butyronitrile polymer, carboxyl styrene-butadiene polymer, neoprene polymer, ethylene-propylene rubber polymer, ethylene/vinyl acetate, epoxy.

29., it is characterized in that pad exterior rim coating can extend across the table plane, surmounts about 5/1000ths English inch to percent of the thickness eight English inch of the coating of showing the plane etc. according to the pad described in the claim 18.

30. according to the pad described in the claim 18, it is characterized in that pad exterior rim coating can extend across the table plane, one of the about percentage of thickness English inch to the percent eight English inch that surmount the coating of showing the plane do not wait.

31., it is characterized in that pad exterior rim coating can extend across each table plane according to the pad described in the claim 18.